NHF – new heroes for Heroes V 3.1.

function LoadNHFNames()
	errorHook(function()
		MessageBox("MAP_INCOMPATIBLE.TXT")
	end)
	doFile(GetMapDataPath()..'NHF-Names.lua')
end

Thank you. It's simple.

Using scripts, you can implement treasure vault protection that depends on the game day. Display the time until the next "population" in the tooltip. Also, set the guard based on the difficulty level.
New combat arenas would be useful here. You could create a unique one for each treasure vault.